6. Organisms Respond to Changes in their Environments: Definitions (A Level only) (AQA A-Level Biology): Flashcards
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Practise the cards
10 cards from this deck
Acetylcholine
Acetylcholine
Neurotransmitter facilitating communication between nerve cells
All-or-nothing principle
All-or-nothing principle
Stimuli above threshold produce identical action potentials
Insulin effect on blood glucose
Insulin effect on blood glucose
Decreases blood glucose
Glucagon effect on blood glucose
Glucagon effect on blood glucose
Increases blood glucose
Motor neurone function
Motor neurone function
Carries impulses from CNS to effectors
Saltatory conduction
Saltatory conduction
Nerve impulse jumps between nodes of Ranvier, speeds transmission
Sliding filament theory key mechanism
Sliding filament theory key mechanism
Myosin filaments pull actin toward sarcomere centre
ADH function
ADH function
Increases water permeability in collecting duct and DCT
Tropism
Tropism
Plant growth response to directional stimuli
Negative feedback
Negative feedback
Counteracts original stimulus, restores optimum point